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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a3367b9ae46c92e0edb206eb3f98e5ba95b930dead6027672567e4e46bb113' 
  AND token = 'u6pHpE1foD2s29J/eccQY8d1CqwRRBZ2OolrPX9a/Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}